C-B-D mentioned that there was hopes for a wealthy registry set player to buy it. I have been active in both registry sets and seem to think there is more favorable hope in the realms of a PCGS Registry Set player. If a coin is in an NGC holder and everyone seems to think it would be just as favorably graded at PCGS then there is less of a challenge to get the money desired. If there is any doubt at all, you will have a big challenge to get the money you want. Also, when trying to get such a premium from a coin in an NGC holder, you might want to at least have a $12 sticker on the holder. I own coins in both holders so I am not being a Kool Aid drinker here, really just discussing the market in general for such an item. I will also admit that some coins in NGC holders do better, like when it comes to some designations like FBL on Franklins, sometimes FB on Mercs, etc. Each company has their strengths but in this particular case, I think a buyer would want significant peace of mind with such a premium. The color is nice but there is way too much risk involved when you consider the "Price Guide" values of an example in 65BN to where it is graded in 66RB....plus the color premium. Like I said earlier, it's pretty. I wish everyone well.
Here are a few photos of the obverse of a 1987 toned proof silver eagle (it's tough to get the exact color, but at least the bluish/purple part around the date should come through)...also it's not toned on the reverse. {any scratches are on holder}